Color change is a good way to detect a chemical reaction. True or False?

As temperature of the water decreases below 4 degrees Celsius, the density of the water

Which of the following materials are minerals, and why (or why not) ? water beach sand diamond wood vitamin pill gold nugget fishbone emerald

Two samples of water are mixed in a styrofoam calorimeter. Sample 1 has a mass of 60.0 g and an initial temperature of 20.0°C. Sample 2 has a mass of 25.0 g and an initial temperature of 100.0°C. Specific heat of liquid water is 4.184 J/gK.

Gold has a density of 0.01932 kg/cm3. What is the mass (in kg) of a 92.5 cm3 sample of gold? A) 1.79B) 0.560C) 92.5D) 0.000209E) 4790

Which of these has an exoskeleton? a. tree b. deer c. elephant d. crab?

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?